package kr.hkit.powerjava.chapter25.chat;

public class QuizProtocol {
	private static final int WAITING = 0;
	private static final int PROBLEM = 1;
	private static final int ANSWER = 2;
	
	private static final int NUMPROBLEM = 3; //문제수
	
	private int state  = QuizProtocol.WAITING; //현재 상태
	private int currentProblem = 0;					//현재 문제 번호
	
	private String[] problems = {"네트워크 처리 패키지는 ? ", "자바의 최신 버젼은 ? ", "인터넷에서 컴퓨터를 식별하는 주소는 ? "};
	private String[] answers = {"Java.io", "1.7", "IP주소"};
	
	public String process(String theInput){
		String theOutput = null;
		switch(state){
			case QuizProtocol.WAITING:
				theOutput = "퀴즈를 시작합니다 (y/n)";
				state = QuizProtocol.PROBLEM;
				break;
			case QuizProtocol.PROBLEM:
				if(theInput.equalsIgnoreCase("y")){
					theOutput = problems[currentProblem];
					state = QuizProtocol.ANSWER;
				}else{
					state = QuizProtocol.WAITING;
					theOutput = "quit";
				}
				break;
			case QuizProtocol.ANSWER:
				if(theInput.equalsIgnoreCase(answers[currentProblem])){
					theOutput = "정답입니다 계속하시겠습니까?(y/n)";
					state = QuizProtocol.PROBLEM;
				}else{
					theOutput = "오답입니다 계속하시겠습니까?(y/n)";
					state = QuizProtocol.PROBLEM;
				}
				currentProblem = (currentProblem + 1)%NUMPROBLEM;
				break;
		}
		return theOutput;
	}
	
	
}
